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<html>
<head>
    <meta charset="UTF-8" />
    <title>details标记与summary标记</title>
</head>
<body>
    <details open>
        <summary>显示挂机用户</summary>
        <ul>
            <li>张三</li>
            <li>李四</li>
            <li>王五</li>
            <li>赵六</li>
        </ul>
    </details>
</body>
</html>